On the rotational analysis of the ground vibrational state of CH3D molecule

The rotational analysis in the ground vibrational state has been carried ou t for CH3D by using the ground state combination differences. More than 150 0 allowed and 2500 forbidden transitions from the fundamental bands v(3), v (5), and v(6) were used to determine 12 rotational parameters, which reprod uce the observed combination differences within an accuracy of 1.0 x 10(-4) cm(-1). Altogether ten independent a(1)-a(2) (K = 3) splittings with J gre ater than or equal to 10 in the vibrational ground state were observed and analyzed both with supercombination differences method [O. N. Ulenikov, S. Alanko, M. Koivusaari, and R. Anttila, Chem. Phys. Lett. 268, 242-248 (1997 )] and by generating energy levels from Hamiltonian. Problems in simultaneo us determination of <(epsilon)over tilde> and (h) over tilde(3), constants responsible for such splittings are discussed. (C) 1999 Academic Press.